Dictionary of Moisture Protection & Restoration

SEALANT APPLICATIONS

Correct

Incorrect

Backer properly inserted. Mortar cut back to provide uniform and proper joint depth. rod

Irregular depth creates unequal stress on sealant = cohesive and adhesive mortar, provide an evenly deep joint and install a backer rod. failures. Remove the

Bondbreaker tape elimin- ates adhesion of the sealant to the back of the joint.

No bondbreaker, sealant adheres to back of the joint, thus creating a cohesive tear when movement occurs

Sealant can only com- pensate for movement at the narrowest point. If the movement exceeds the sealant’s limitation, a cohesive tear will develop.

The bondbreaker increased width at the base increasing the sealant’s ability to compensate for greater movement.

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